1. Bastyr University Research Institute, 4106 Sorrento Valley Blvd, San Diego, CA 92121, USA.
2. University of Washington, Health Sciences Building F243, Box 357236, 1959 NE Pacific Street, Seattle, WA 98155, USA
3. University of Vermont, Laboratory for Clinical Biochemistry Research, University of Vermont College of Medicine, 208 South Park Drive, 201B, Colchester, VT 05446, USA
4. Kyungpook National University, School of Medicine, 680 Gukchaebosang-ro, Jung-gu, Daegu 700-842, Republic of Korea
5. University of Minnesota, Div. Epidemiology & Community Health, 1300 S. 2nd Street, Suite 300, Minneapolis, MN 55454, USA